There's some good news today for Halo fans that didn't want to upgrade to Windows 8 – Halo: Spartan Assault has appeared on Steam with the operating system requirement listed at "Windows Vista, 7, 8 and 8.1." Launching on April 4, 2014, it will take full advantage of Steam, with Steam Achievements, Steam Leaderboards, Steam Cloud, and Steam Trading Cards. This marks the first time a Halo game has arrived on Steam.